His wife, Baroness Meyer, says his nose may be broken and his eye has swollen to the size of a golf ball

Baroness Meyer said the dad-of-four was taken to St Mary’s Hospital in Paddington and doesn’t remember anything.

The attack, a day before Donald Trump’s first visit to the UK as president of the US, is not thought to have been politically motivated, despite suggestions by the former Ukip leader Nigel Farage.

Mr Farage tweeted: “He [Sir Christopher] has been doing a lot of media about how important the Trump visit is. Police say it looks like a robbery - we’ll see.”

Sir Christopher had called for Britain to engage with President Trump during his visit, and not to turn its back on him.

Thoughts with former British ambassador to the US, Sir Christopher Meyer, who was brutally attacked yesterday. He has been doing a lot of media about how important the Trump visit is. Police say it looks like a robbery - we’ll see. https://t.co/XS1MyfoAFY

British Ambassador Sir Christopher Meyer in the Oval Office of the White House with President George Bush during his posting to Washington

The ex-British ambassador was due to make several TV interviews to discuss the official visit, but has now had to cancel them due to his injuries.

Lady Meyer added: “At first I thought that the attack was politically motivated. He is opinionated, and sometimes people have different opinions, but the police told me they believe that it is more likely that they might have wanted to rob him."

She said nothing was stolen as British Transport Police intervened quickly.

The children and families minister, Nadhim Zahawi, described the attack as “sick”.

Sir Christopher Meyer is now recovering in hospital after being set upon at Victoria Underground station

Lady Meyer was ceremonially introduced to the House of Lords on Monday after her appointment in May sparked controversy - as she is close pals with the PM.

The 65-year-old previously experienced family trauma when her first husband abducted their children and took them to Germany for nine years.

She said she now plans to raise the issue of violent crime in the House of Lords.

"I think we really need to stop this, if you can't walk in London because of fear of being attacked brutally", she said.

It comes as police struggle to cope with a wave of violent crime across the country. Violent offences were up 21 per cent last year, with 1.3million recorded – the most since records began 15 years ago.

A British Transport Police spokesperson said: "Officers were called to Victoria Underground Station at 2.45 pm on Wednesday after receiving reports that a man had been seriously assaulted.

"A 16-year-old boy from Hillingdon and a 15-year-old girl from Croydon were both arrested on suspicion of assault occasioning grievous bodily harm.

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"They have been released under investigation while enquiries into the incident continue.

"A man in his seventies was taken to hospital, though his injuries are not believed to be life threatening or changing."

If anyone witnessed the assault taking place, we urge them to contact BTP by calling 0800 40 50 40 or texting 61016, with the reference 334 of 11 July.

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